Perennial, dioecious, rarely monoecious herbs. Rhizomes short- to long-creeping. Stems green, thin and wiry, branched and often slightly flexuose. Leaves reduced to persistent sheathing bracts. Male and female inflorescences ± similar. Male spikelets 2 or more together, rarely solitary; each spikelet 1–many-flowered and subtended by 2 glume-like floral bracts. Male flowers with 6, pale, membranous (glume-like) perianth parts. Female spikelets in distal axils of leaves, sessile, solitary, 1-flowered and subtended by 1–3 glumelike floral bracts. Female flowers with 4 or 6 pale, membranous perianth parts; staminodes absent; ovary unilocular; style with 2 or 3 branches. Fruit a small ovoid or obovoid nut.
2 species occurring in Australia and New Zealand, 1 in Victoria.